FORTH by W. P. SALMAN, O. Tisserand, B. Toulout

By W. P. SALMAN, O. Tisserand, B. Toulout

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LOOP DO••• +LOOP U< u --- ) ul u2 --- b ) Compares two unsigned singlelength numbers IF ( b --- ) If the boolean value at the top of the stack is true on IF, executes xxx; otherwise executes yyy; continues with zzz regardless DO ( nl n2 --LOOP ( --- ) Finite loop structure. The loop will be repeated as long as the index remains less than the end, with automatic incrementation of the index DO ( nl n2 --- ) +LOOP ( n --- ) Like DO ... LOOP, except that the index is the value currently on the stack when +LOOP is executed BEGIN...

4 Boolean Operators The traditionally used boolean operators are AND, OR and complement - represented in FORTH respectively by *, +, and 0=. For memory, the truth tables of these three logical operators are n1 n2 n1 • T F + T F T t f T t t F f f F t f n2 n1 OR AND - n1 T f F t Complement Let us take as an application example a test to establish if a number belongs to an open interval. The values will be entered on the stack in the order ( Lower bound n Upper bound --- ) The result of the test is itself returned to the stack.

DISP2 25 OK ( --- ) The possibility of coding digits one by one allows characters to be inserted between digits by means of the word HOLD, preceded by the ASCII code that one wants to insert. Example Editing after fixed-point calculation to two decimal places. # <# # # 46 HOLD #S #> TYPE; OK 123459 . 49 OK Remember that the interpreter identifies double-length values by an included decimal point (see previous example). Do not try to make a comparison between the FORTH concept of format and that of other current high-level languages.

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